dali-toolkit/internal/focus-manager/keyboard-focus-manager-impl.cpp

   1 /*
   2  * Copyright (c) 2021 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 // CLASS HEADER
  19 #include "keyboard-focus-manager-impl.h"
  20
  21 // EXTERNAL INCLUDES
  22 #include <dali/devel-api/actors/actor-devel.h>
  23 #include <dali/devel-api/adaptor-framework/lifecycle-controller.h>
  24 #include <dali/devel-api/common/singleton-service.h>
  25 #include <dali/integration-api/adaptor-framework/adaptor.h>
  26 #include <dali/integration-api/adaptor-framework/scene-holder.h>
  27 #include <dali/integration-api/debug.h>
  28 #include <dali/public-api/actors/layer.h>
  29 #include <dali/public-api/animation/constraints.h>
  30 #include <dali/public-api/events/key-event.h>
  31 #include <dali/public-api/events/touch-event.h>
  32 #include <dali/public-api/object/property-map.h>
  33 #include <dali/public-api/object/type-registry-helper.h>
  34 #include <dali/public-api/object/type-registry.h>
  35 #include <cstring> // for strcmp
  36
  37 // INTERNAL INCLUDES
  38 #include <dali-toolkit/devel-api/asset-manager/asset-manager.h>
  39 #include <dali-toolkit/devel-api/controls/control-devel.h>
  40 #include <dali-toolkit/devel-api/focus-manager/focus-finder.h>
  41 #include <dali-toolkit/devel-api/styling/style-manager-devel.h>
  42 #include <dali-toolkit/public-api/controls/control-impl.h>
  43 #include <dali-toolkit/public-api/controls/control.h>
  44 #include <dali-toolkit/public-api/controls/image-view/image-view.h>
  45 #include <dali-toolkit/public-api/styling/style-manager.h>
  46 #include <dali/devel-api/adaptor-framework/accessibility.h>
  47
  48 namespace Dali
  49 {
  50 namespace Toolkit
  51 {
  52 namespace Internal
  53 {
  54 namespace // Unnamed namespace
  55 {
  56 #if defined(DEBUG_ENABLED)
  57 Debug::Filter* gLogFilter = Debug::Filter::New(Debug::NoLogging, false, "LOG_KEYBOARD_FOCUS_MANAGER");
  58 #endif
  59
  60 const char* const IS_FOCUS_GROUP_PROPERTY_NAME = "isKeyboardFocusGroup"; // This property will be replaced by a flag in Control.
  61
  62 const char* const FOCUS_BORDER_IMAGE_FILE_NAME = "keyboard_focus.9.png";
  63
  64 BaseHandle Create()
  65 {
  66   BaseHandle handle = KeyboardFocusManager::Get();
  67
  68   if(!handle)
  69   {
  70     SingletonService singletonService(SingletonService::Get());
  71     if(singletonService)
  72     {
  73       Toolkit::KeyboardFocusManager manager = Toolkit::KeyboardFocusManager(new Internal::KeyboardFocusManager());
  74       singletonService.Register(typeid(manager), manager);
  75       handle = manager;
  76     }
  77   }
  78
  79   return handle;
  80 }
  81
  82 DALI_TYPE_REGISTRATION_BEGIN_CREATE(Toolkit::KeyboardFocusManager, Dali::BaseHandle, Create, true)
  83
  84 DALI_SIGNAL_REGISTRATION(Toolkit, KeyboardFocusManager, "keyboardPreFocusChange", SIGNAL_PRE_FOCUS_CHANGE)
  85 DALI_SIGNAL_REGISTRATION(Toolkit, KeyboardFocusManager, "keyboardFocusChanged", SIGNAL_FOCUS_CHANGED)
  86 DALI_SIGNAL_REGISTRATION(Toolkit, KeyboardFocusManager, "keyboardFocusGroupChanged", SIGNAL_FOCUS_GROUP_CHANGED)
  87 DALI_SIGNAL_REGISTRATION(Toolkit, KeyboardFocusManager, "keyboardFocusedActorEnterKey", SIGNAL_FOCUSED_ACTOR_ENTER_KEY)
  88
  89 DALI_TYPE_REGISTRATION_END()
  90
  91 const unsigned int MAX_HISTORY_AMOUNT = 30; ///< Max length of focus history stack
  92
  93 } // unnamed namespace
  94
  95 Toolkit::KeyboardFocusManager KeyboardFocusManager::Get()
  96 {
  97   Toolkit::KeyboardFocusManager manager;
  98
  99   SingletonService singletonService(SingletonService::Get());
 100   if(singletonService)
 101   {
 102     // Check whether the keyboard focus manager is already created
 103     Dali::BaseHandle handle = singletonService.GetSingleton(typeid(Toolkit::KeyboardFocusManager));
 104     if(handle)
 105     {
 106       // If so, downcast the handle of singleton to keyboard focus manager
 107       manager = Toolkit::KeyboardFocusManager(dynamic_cast<KeyboardFocusManager*>(handle.GetObjectPtr()));
 108     }
 109   }
 110
 111   return manager;
 112 }
 113
 114 KeyboardFocusManager::KeyboardFocusManager()
 115 : mPreFocusChangeSignal(),
 116   mFocusChangedSignal(),
 117   mFocusGroupChangedSignal(),
 118   mFocusedActorEnterKeySignal(),
 119   mCurrentFocusActor(),
 120   mFocusIndicatorActor(),
 121   mFocusHistory(),
 122   mSlotDelegate(this),
 123   mCustomAlgorithmInterface(NULL),
 124   mCurrentFocusedWindow(),
 125   mIsFocusIndicatorShown(UNKNOWN),
 126   mEnableFocusIndicator(ENABLE),
 127   mAlwaysShowIndicator(ALWAYS_SHOW),
 128   mFocusGroupLoopEnabled(false),
 129   mIsWaitingKeyboardFocusChangeCommit(false),
 130   mClearFocusOnTouch(true),
 131   mEnableDefaultAlgorithm(false)
 132 {
 133   // TODO: Get FocusIndicatorEnable constant from stylesheet to set mIsFocusIndicatorShown.
 134
 135   LifecycleController::Get().InitSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnAdaptorInit);
 136 }
 137
 138 void KeyboardFocusManager::OnAdaptorInit()
 139 {
 140   if(Adaptor::IsAvailable())
 141   {
 142     // Retrieve all the existing scene holders
 143     Dali::SceneHolderList sceneHolders = Adaptor::Get().GetSceneHolders();
 144     for(auto iter = sceneHolders.begin(); iter != sceneHolders.end(); ++iter)
 145     {
 146       (*iter).KeyEventSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnKeyEvent);
 147       (*iter).TouchedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnTouch);
 148       (*iter).WheelEventGeneratedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnWheelEvent);
 149       Dali::Window window = DevelWindow::DownCast(*iter);
 150       if(window)
 151       {
 152         window.FocusChangeSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnWindowFocusChanged);
 153       }
 154     }
 155
 156     // Get notified when any new scene holder is created afterwards
 157     Adaptor::Get().WindowCreatedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnSceneHolderCreated);
 158   }
 159 }
 160
 161 void KeyboardFocusManager::OnSceneHolderCreated(Dali::Integration::SceneHolder& sceneHolder)
 162 {
 163   sceneHolder.KeyEventSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnKeyEvent);
 164   sceneHolder.TouchedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnTouch);
 165   sceneHolder.WheelEventGeneratedSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnWheelEvent);
 166   Dali::Window window = DevelWindow::DownCast(sceneHolder);
 167   if(window)
 168   {
 169     window.FocusChangeSignal().Connect(mSlotDelegate, &KeyboardFocusManager::OnWindowFocusChanged);
 170   }
 171 }
 172
 173 KeyboardFocusManager::~KeyboardFocusManager()
 174 {
 175 }
 176
 177 void KeyboardFocusManager::GetConfigurationFromStyleManger()
 178 {
 179   Toolkit::StyleManager styleManager = Toolkit::StyleManager::Get();
 180   if(styleManager)
 181   {
 182     Property::Map config   = Toolkit::DevelStyleManager::GetConfigurations(styleManager);
 183     mAlwaysShowIndicator   = config["alwaysShowFocus"].Get<bool>() ? ALWAYS_SHOW : NONE;
 184     mIsFocusIndicatorShown = (mAlwaysShowIndicator == ALWAYS_SHOW) ? SHOW : HIDE;
 185     mClearFocusOnTouch     = (mIsFocusIndicatorShown == SHOW) ? false : true;
 186   }
 187 }
 188
 189 bool KeyboardFocusManager::SetCurrentFocusActor(Actor actor)
 190 {
 191   DALI_ASSERT_DEBUG(!mIsWaitingKeyboardFocusChangeCommit && "Calling this function in the PreFocusChangeSignal callback?");
 192
 193   if(mIsFocusIndicatorShown == UNKNOWN)
 194   {
 195     GetConfigurationFromStyleManger();
 196   }
 197
 198   return DoSetCurrentFocusActor(actor);
 199 }
 200
 201 bool KeyboardFocusManager::DoSetCurrentFocusActor(Actor actor)
 202 {
 203   bool success = false;
 204
 205   // If the parent's KEYBOARD_FOCUSABLE_CHILDREN is false, it cannot have focus.
 206   if(actor)
 207   {
 208     Actor parent = actor.GetParent();
 209     while(parent)
 210     {
 211       if(!parent.GetProperty<bool>(DevelActor::Property::KEYBOARD_FOCUSABLE_CHILDREN))
 212       {
 213         DALI_LOG_INFO(gLogFilter, Debug::General, "[%s:%d] Parent Actor has KEYBOARD_FOCUSABLE_CHILDREN false,\n", __FUNCTION__, __LINE__);
 214         return false;
 215       }
 216       parent = parent.GetParent();
 217     }
 218   }
 219
 220   if(actor && actor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE) && actor.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 221   {
 222     Integration::SceneHolder currentWindow = Integration::SceneHolder::Get(actor);
 223
 224     if(currentWindow.GetRootLayer() != mCurrentFocusedWindow.GetHandle())
 225     {
 226       Layer rootLayer       = currentWindow.GetRootLayer();
 227       mCurrentFocusedWindow = rootLayer;
 228     }
 229   }
 230
 231   Actor currentFocusedActor = GetCurrentFocusActor();
 232
 233   // If developer set focus on same actor, doing nothing
 234   if(actor == currentFocusedActor)
 235   {
 236     if(!actor)
 237     {
 238       return false;
 239     }
 240     return true;
 241   }
 242
 243   // Check whether the actor is in the stage and is keyboard focusable.
 244   if(actor && actor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE) && actor.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 245   {
 246     if((mIsFocusIndicatorShown == SHOW) && (mEnableFocusIndicator == ENABLE))
 247     {
 248       actor.Add(GetFocusIndicatorActor());
 249     }
 250
 251     // Send notification for the change of focus actor
 252     if(!mFocusChangedSignal.Empty())
 253     {
 254       mFocusChangedSignal.Emit(currentFocusedActor, actor);
 255     }
 256
 257     Toolkit::Control currentlyFocusedControl = Toolkit::Control::DownCast(currentFocusedActor);
 258     if(currentlyFocusedControl)
 259     {
 260       // Do we need it to remember if it was previously DISABLED?
 261       currentlyFocusedControl.SetProperty(DevelControl::Property::STATE, DevelControl::NORMAL);
 262       currentlyFocusedControl.ClearKeyInputFocus();
 263     }
 264
 265     DALI_LOG_INFO(gLogFilter, Debug::General, "[%s:%d] Focus Changed\n", __FUNCTION__, __LINE__);
 266
 267     // Save the current focused actor
 268     mCurrentFocusActor = actor;
 269
 270     bool focusedWindowFound = false;
 271     for(unsigned int i = 0; i < mCurrentFocusActors.size(); i++)
 272     {
 273       if(mCurrentFocusActors[i].first == mCurrentFocusedWindow)
 274       {
 275         mCurrentFocusActors[i].second = actor;
 276         focusedWindowFound            = true;
 277         break;
 278       }
 279     }
 280     if(!focusedWindowFound)
 281     {
 282       // A new window gains the focus, so store the focused actor in that window.
 283       mCurrentFocusActors.push_back(std::pair<WeakHandle<Layer>, WeakHandle<Actor> >(mCurrentFocusedWindow, actor));
 284     }
 285
 286     Toolkit::Control newlyFocusedControl = Toolkit::Control::DownCast(actor);
 287     if(newlyFocusedControl)
 288     {
 289       newlyFocusedControl.SetProperty(DevelControl::Property::STATE, DevelControl::FOCUSED);
 290       newlyFocusedControl.SetKeyInputFocus();
 291     }
 292
 293     // Push Current Focused Actor to FocusHistory
 294     mFocusHistory.push_back(actor);
 295
 296     // Delete first element before add new element when Stack is full.
 297     if(mFocusHistory.size() > MAX_HISTORY_AMOUNT)
 298     {
 299       FocusStackIterator beginPos = mFocusHistory.begin();
 300       mFocusHistory.erase(beginPos);
 301     }
 302
 303     DALI_LOG_INFO(gLogFilter, Debug::General, "[%s:%d] SUCCEED\n", __FUNCTION__, __LINE__);
 304     success = true;
 305   }
 306   else
 307   {
 308     DALI_LOG_WARNING("[%s:%d] FAILED\n", __FUNCTION__, __LINE__);
 309   }
 310
 311   return success;
 312 }
 313
 314 Actor KeyboardFocusManager::GetCurrentFocusActor()
 315 {
 316   Actor actor = mCurrentFocusActor.GetHandle();
 317
 318   if(actor && !actor.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 319   {
 320     // If the actor has been removed from the stage, then it should not be focused
 321     actor.Reset();
 322     mCurrentFocusActor.Reset();
 323   }
 324   return actor;
 325 }
 326
 327 Actor KeyboardFocusManager::GetFocusActorFromCurrentWindow()
 328 {
 329   Actor        actor;
 330   unsigned int index;
 331   for(index = 0; index < mCurrentFocusActors.size(); index++)
 332   {
 333     if(mCurrentFocusActors[index].first == mCurrentFocusedWindow)
 334     {
 335       actor = mCurrentFocusActors[index].second.GetHandle();
 336       break;
 337     }
 338   }
 339
 340   if(actor && !actor.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 341   {
 342     // If the actor has been removed from the window, then the window doesn't have any focused actor
 343     actor.Reset();
 344     mCurrentFocusActors.erase(mCurrentFocusActors.begin() + index);
 345   }
 346
 347   return actor;
 348 }
 349
 350 Actor KeyboardFocusManager::GetCurrentFocusGroup()
 351 {
 352   return GetFocusGroup(GetCurrentFocusActor());
 353 }
 354
 355 void KeyboardFocusManager::MoveFocusBackward()
 356 {
 357   // Find Pre Focused Actor when the list size is more than 1
 358   if(mFocusHistory.size() > 1)
 359   {
 360     // Delete current focused actor in history
 361     mFocusHistory.pop_back();
 362
 363     // If pre-focused actors are not on stage or deleted, remove them in stack
 364     while(mFocusHistory.size() > 0)
 365     {
 366       // Get pre focused actor
 367       Actor target = mFocusHistory[mFocusHistory.size() - 1].GetHandle();
 368
 369       // Impl of Actor is not null
 370       if(target && target.GetProperty<bool>(Actor::Property::CONNECTED_TO_SCENE))
 371       {
 372         // Delete pre focused actor in history because it will pushed again by SetCurrentFocusActor()
 373         mFocusHistory.pop_back();
 374         SetCurrentFocusActor(target);
 375         break;
 376       }
 377       else
 378       {
 379         // Target is empty handle or off stage. Erase from queue
 380         mFocusHistory.pop_back();
 381       }
 382     }
 383
 384     // if there is no actor which can get focus, then push current focus actor in stack again
 385     if(mFocusHistory.size() == 0)
 386     {
 387       Actor currentFocusedActor = GetCurrentFocusActor();
 388       mFocusHistory.push_back(currentFocusedActor);
 389     }
 390   }
 391 }
 392
 393 bool KeyboardFocusManager::IsLayoutControl(Actor actor) const
 394 {
 395   Toolkit::Control control = Toolkit::Control::DownCast(actor);
 396   return control && GetImplementation(control).IsKeyboardNavigationSupported();
 397 }
 398
 399 Toolkit::Control KeyboardFocusManager::GetParentLayoutControl(Actor actor) const
 400 {
 401   // Get the actor's parent layout control that supports two dimensional keyboard navigation
 402   Actor rootActor;
 403   Actor parent;
 404   if(actor)
 405   {
 406     Integration::SceneHolder window = Integration::SceneHolder::Get(actor);
 407     if(window)
 408     {
 409       rootActor = window.GetRootLayer();
 410     }
 411
 412     parent = actor.GetParent();
 413   }
 414
 415   while(parent && !IsLayoutControl(parent) && parent != rootActor)
 416   {
 417     parent = parent.GetParent();
 418   }
 419
 420   return Toolkit::Control::DownCast(parent);
 421 }
 422
 423 bool KeyboardFocusManager::MoveFocus(Toolkit::Control::KeyboardFocus::Direction direction, const std::string& deviceName)
 424 {
 425   Actor currentFocusActor = GetCurrentFocusActor();
 426
 427   bool succeed = false;
 428
 429   // Go through the actor's hierarchy until we find a layout control that knows how to move the focus
 430   Toolkit::Control parentLayoutControl = GetParentLayoutControl(currentFocusActor);
 431   while(parentLayoutControl && !succeed)
 432   {
 433     succeed             = DoMoveFocusWithinLayoutControl(parentLayoutControl, currentFocusActor, direction);
 434     parentLayoutControl = GetParentLayoutControl(parentLayoutControl);
 435   }
 436
 437   if(!succeed)
 438   {
 439     Actor nextFocusableActor;
 440
 441     Toolkit::Control currentFocusControl = Toolkit::Control::DownCast(currentFocusActor);
 442
 443     // If the current focused actor is a control, then find the next focusable actor via the focusable properties.
 444     if(currentFocusControl)
 445     {
 446       int             actorId = -1;
 447       Property::Index index   = Property::INVALID_INDEX;
 448       Property::Value value;
 449
 450       // Find property index based upon focus direction
 451       switch(direction)
 452       {
 453         case Toolkit::Control::KeyboardFocus::LEFT:
 454         {
 455           index = Toolkit::DevelControl::Property::LEFT_FOCUSABLE_ACTOR_ID;
 456           break;
 457         }
 458         case Toolkit::Control::KeyboardFocus::RIGHT:
 459         {
 460           index = Toolkit::DevelControl::Property::RIGHT_FOCUSABLE_ACTOR_ID;
 461           break;
 462         }
 463         case Toolkit::Control::KeyboardFocus::UP:
 464         {
 465           index = Toolkit::DevelControl::Property::UP_FOCUSABLE_ACTOR_ID;
 466           break;
 467         }
 468         case Toolkit::Control::KeyboardFocus::DOWN:
 469         {
 470           index = Toolkit::DevelControl::Property::DOWN_FOCUSABLE_ACTOR_ID;
 471           break;
 472         }
 473         default:
 474           break;
 475       }
 476
 477       // If the focusable property is set then determine next focusable actor
 478       if(index != Property::INVALID_INDEX)
 479       {
 480         value   = currentFocusActor.GetProperty(index);
 481         actorId = value.Get<int>();
 482
 483         // If actor's id is valid then find actor form actor's id. The actor should be on the stage.
 484         if(actorId != -1)
 485         {
 486           if(currentFocusActor.GetParent())
 487           {
 488             nextFocusableActor = currentFocusActor.GetParent().FindChildById(actorId);
 489           }
 490
 491           if(!nextFocusableActor)
 492           {
 493             Integration::SceneHolder window = Integration::SceneHolder::Get(currentFocusActor);
 494             if(window)
 495             {
 496               nextFocusableActor = window.GetRootLayer().FindChildById(actorId);
 497             }
 498           }
 499         }
 500       }
 501     }
 502
 503     if(!nextFocusableActor)
 504     {
 505       // If the implementation of CustomAlgorithmInterface is provided then the PreFocusChangeSignal is no longer emitted.
 506       if(mCustomAlgorithmInterface)
 507       {
 508         mIsWaitingKeyboardFocusChangeCommit = true;
 509         nextFocusableActor                  = mCustomAlgorithmInterface->GetNextFocusableActor(currentFocusActor, Actor(), direction, deviceName);
 510         mIsWaitingKeyboardFocusChangeCommit = false;
 511       }
 512       else if(!mPreFocusChangeSignal.Empty())
 513       {
 514         // Don't know how to move the focus further. The application needs to tell us which actor to move the focus to
 515         mIsWaitingKeyboardFocusChangeCommit = true;
 516         nextFocusableActor                  = mPreFocusChangeSignal.Emit(currentFocusActor, Actor(), direction);
 517         mIsWaitingKeyboardFocusChangeCommit = false;
 518       }
 519       else if (mEnableDefaultAlgorithm)
 520       {
 521         Layer rootLayer;
 522         if (currentFocusActor)
 523         {
 524           // Find the window of the focused actor.
 525           Integration::SceneHolder window = Integration::SceneHolder::Get(currentFocusActor);
 526           if (window)
 527           {
 528             rootLayer = window.GetRootLayer();
 529           }
 530         }
 531         else
 532         {
 533           // Searches from the currently focused window.
 534           rootLayer = mCurrentFocusedWindow.GetHandle();
 535         }
 536         if (rootLayer)
 537         {
 538           // We should find it among the actors nearby.
 539           nextFocusableActor = Toolkit::FocusFinder::GetNearestFocusableActor(rootLayer, currentFocusActor, direction);
 540         }
 541       }
 542     }
 543
 544     if(nextFocusableActor && nextFocusableActor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE))
 545     {
 546       // Whether the next focusable actor is a layout control
 547       if(IsLayoutControl(nextFocusableActor))
 548       {
 549         // If so, move the focus inside it.
 550         Toolkit::Control layoutControl = Toolkit::Control::DownCast(nextFocusableActor);
 551         succeed                        = DoMoveFocusWithinLayoutControl(layoutControl, currentFocusActor, direction);
 552       }
 553       else
 554       {
 555         // Otherwise, just set focus to the next focusable actor
 556         succeed = SetCurrentFocusActor(nextFocusableActor);
 557       }
 558     }
 559   }
 560
 561   return succeed;
 562 }
 563
 564 bool KeyboardFocusManager::DoMoveFocusWithinLayoutControl(Toolkit::Control control, Actor actor, Toolkit::Control::KeyboardFocus::Direction direction)
 565 {
 566   // Ask the control for the next actor to focus
 567   Actor nextFocusableActor = GetImplementation(control).GetNextKeyboardFocusableActor(actor, direction, mFocusGroupLoopEnabled);
 568   if(nextFocusableActor)
 569   {
 570     if(!nextFocusableActor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE))
 571     {
 572       // If the actor is not focusable, ask the same layout control for the next actor to focus
 573       return DoMoveFocusWithinLayoutControl(control, nextFocusableActor, direction);
 574     }
 575     else
 576     {
 577       Actor currentFocusActor   = GetCurrentFocusActor();
 578       Actor committedFocusActor = nextFocusableActor;
 579
 580       // We will try to move the focus to the actor. Emit a signal to notify the proposed actor to focus
 581       // Signal handler can check the proposed actor and return a different actor if it wishes.
 582       if(!mPreFocusChangeSignal.Empty())
 583       {
 584         mIsWaitingKeyboardFocusChangeCommit = true;
 585         committedFocusActor                 = mPreFocusChangeSignal.Emit(currentFocusActor, nextFocusableActor, direction);
 586         mIsWaitingKeyboardFocusChangeCommit = false;
 587       }
 588
 589       if(committedFocusActor && committedFocusActor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE))
 590       {
 591         // Whether the commited focusable actor is a layout control
 592         if(IsLayoutControl(committedFocusActor))
 593         {
 594           // If so, move the focus inside it.
 595           Toolkit::Control layoutControl = Toolkit::Control::DownCast(committedFocusActor);
 596           return DoMoveFocusWithinLayoutControl(layoutControl, currentFocusActor, direction);
 597         }
 598         else
 599         {
 600           // Otherwise, just set focus to the next focusable actor
 601           if(committedFocusActor == nextFocusableActor)
 602           {
 603             // If the application hasn't changed our proposed actor, we informs the layout control we will
 604             // move the focus to what the control returns. The control might wish to perform some actions
 605             // before the focus is actually moved.
 606             GetImplementation(control).OnKeyboardFocusChangeCommitted(committedFocusActor);
 607           }
 608
 609           return SetCurrentFocusActor(committedFocusActor);
 610         }
 611       }
 612       else
 613       {
 614         return false;
 615       }
 616     }
 617   }
 618   else
 619   {
 620     // No more actor can be focused in the given direction within the same layout control.
 621     return false;
 622   }
 623 }
 624
 625 bool KeyboardFocusManager::DoMoveFocusToNextFocusGroup(bool forward)
 626 {
 627   bool succeed = false;
 628
 629   // Get the parent layout control of the current focus group
 630   Toolkit::Control parentLayoutControl = GetParentLayoutControl(GetCurrentFocusGroup());
 631
 632   while(parentLayoutControl && !succeed)
 633   {
 634     // If the current focus group has a parent layout control, we can probably automatically
 635     // move the focus to the next focus group in the forward or backward direction.
 636     Toolkit::Control::KeyboardFocus::Direction direction = forward ? Toolkit::Control::KeyboardFocus::RIGHT : Toolkit::Control::KeyboardFocus::LEFT;
 637     succeed                                              = DoMoveFocusWithinLayoutControl(parentLayoutControl, GetCurrentFocusActor(), direction);
 638     parentLayoutControl                                  = GetParentLayoutControl(parentLayoutControl);
 639   }
 640
 641   if(!mFocusGroupChangedSignal.Empty())
 642   {
 643     // Emit a focus group changed signal. The applicaton can move the focus to a new focus group
 644     mFocusGroupChangedSignal.Emit(GetCurrentFocusActor(), forward);
 645   }
 646
 647   return succeed;
 648 }
 649
 650 void KeyboardFocusManager::DoKeyboardEnter(Actor actor)
 651 {
 652   if(actor)
 653   {
 654     Toolkit::Control control = Toolkit::Control::DownCast(actor);
 655     if(control)
 656     {
 657       // Notify the control that enter has been pressed on it.
 658       GetImplementation(control).KeyboardEnter();
 659     }
 660
 661     // Send a notification for the actor.
 662     if(!mFocusedActorEnterKeySignal.Empty())
 663     {
 664       mFocusedActorEnterKeySignal.Emit(actor);
 665     }
 666   }
 667 }
 668
 669 void KeyboardFocusManager::ClearFocus()
 670 {
 671   Actor actor = GetCurrentFocusActor();
 672   if(actor)
 673   {
 674     if(mFocusIndicatorActor)
 675     {
 676       actor.Remove(mFocusIndicatorActor);
 677     }
 678
 679     // Send notification for the change of focus actor
 680     if(!mFocusChangedSignal.Empty())
 681     {
 682       mFocusChangedSignal.Emit(actor, Actor());
 683     }
 684
 685     Toolkit::Control currentlyFocusedControl = Toolkit::Control::DownCast(actor);
 686     if(currentlyFocusedControl)
 687     {
 688       currentlyFocusedControl.SetProperty(DevelControl::Property::STATE, DevelControl::NORMAL);
 689       currentlyFocusedControl.ClearKeyInputFocus();
 690     }
 691   }
 692
 693   mCurrentFocusActor.Reset();
 694   mIsFocusIndicatorShown = (mAlwaysShowIndicator == ALWAYS_SHOW) ? SHOW : HIDE;
 695 }
 696
 697 void KeyboardFocusManager::SetFocusGroupLoop(bool enabled)
 698 {
 699   mFocusGroupLoopEnabled = enabled;
 700 }
 701
 702 bool KeyboardFocusManager::GetFocusGroupLoop() const
 703 {
 704   return mFocusGroupLoopEnabled;
 705 }
 706
 707 void KeyboardFocusManager::SetAsFocusGroup(Actor actor, bool isFocusGroup)
 708 {
 709   if(actor)
 710   {
 711     // Create/Set focus group property.
 712     actor.RegisterProperty(IS_FOCUS_GROUP_PROPERTY_NAME, isFocusGroup, Property::READ_WRITE);
 713   }
 714 }
 715
 716 bool KeyboardFocusManager::IsFocusGroup(Actor actor) const
 717 {
 718   // Check whether the actor is a focus group
 719   bool isFocusGroup = false;
 720
 721   if(actor)
 722   {
 723     Property::Index propertyIsFocusGroup = actor.GetPropertyIndex(IS_FOCUS_GROUP_PROPERTY_NAME);
 724     if(propertyIsFocusGroup != Property::INVALID_INDEX)
 725     {
 726       isFocusGroup = actor.GetProperty<bool>(propertyIsFocusGroup);
 727     }
 728   }
 729
 730   return isFocusGroup;
 731 }
 732
 733 Actor KeyboardFocusManager::GetFocusGroup(Actor actor)
 734 {
 735   // Go through the actor's hierarchy to check which focus group the actor belongs to
 736   while(actor && !IsFocusGroup(actor))
 737   {
 738     actor = actor.GetParent();
 739   }
 740
 741   return actor;
 742 }
 743
 744 void KeyboardFocusManager::SetFocusIndicatorActor(Actor indicator)
 745 {
 746   if(mFocusIndicatorActor != indicator)
 747   {
 748     Actor currentFocusActor = GetCurrentFocusActor();
 749     if(currentFocusActor)
 750     {
 751       // The new focus indicator should be added to the current focused actor immediately
 752       if(mFocusIndicatorActor)
 753       {
 754         currentFocusActor.Remove(mFocusIndicatorActor);
 755       }
 756
 757       if(indicator)
 758       {
 759         currentFocusActor.Add(indicator);
 760       }
 761     }
 762
 763     mFocusIndicatorActor = indicator;
 764   }
 765 }
 766
 767 Actor KeyboardFocusManager::GetFocusIndicatorActor()
 768 {
 769   if(!mFocusIndicatorActor)
 770   {
 771     // Create the default if it hasn't been set and one that's shared by all the keyboard focusable actors
 772     const std::string imageDirPath = AssetManager::GetDaliImagePath();
 773     mFocusIndicatorActor           = Toolkit::ImageView::New(imageDirPath + FOCUS_BORDER_IMAGE_FILE_NAME);
 774
 775     // Apply size constraint to the focus indicator
 776     mFocusIndicatorActor.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS);
 777   }
 778
 779   mFocusIndicatorActor.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
 780   mFocusIndicatorActor.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
 781   mFocusIndicatorActor.SetProperty(Actor::Property::POSITION, Vector2(0.0f, 0.0f));
 782
 783   return mFocusIndicatorActor;
 784 }
 785
 786 void KeyboardFocusManager::OnKeyEvent(const KeyEvent& event)
 787 {
 788   const std::string& keyName = event.GetKeyName();
 789   const std::string& deviceName = event.GetDeviceName();
 790
 791   if(mIsFocusIndicatorShown == UNKNOWN)
 792   {
 793     GetConfigurationFromStyleManger();
 794   }
 795
 796   bool isFocusStartableKey = false;
 797
 798   if(event.GetState() == KeyEvent::DOWN)
 799   {
 800     if(keyName == "Left")
 801     {
 802       if(mIsFocusIndicatorShown == HIDE)
 803       {
 804         // Show focus indicator
 805         mIsFocusIndicatorShown = SHOW;
 806       }
 807       else
 808       {
 809         // Move the focus towards left
 810         MoveFocus(Toolkit::Control::KeyboardFocus::LEFT, deviceName);
 811       }
 812
 813       isFocusStartableKey = true;
 814     }
 815     else if(keyName == "Right")
 816     {
 817       if(mIsFocusIndicatorShown == HIDE)
 818       {
 819         // Show focus indicator
 820         mIsFocusIndicatorShown = SHOW;
 821       }
 822       else
 823       {
 824         // Move the focus towards right
 825         MoveFocus(Toolkit::Control::KeyboardFocus::RIGHT, deviceName);
 826       }
 827
 828       isFocusStartableKey = true;
 829     }
 830     else if(keyName == "Up")
 831     {
 832       if(mIsFocusIndicatorShown == HIDE)
 833       {
 834         // Show focus indicator
 835         mIsFocusIndicatorShown = SHOW;
 836       }
 837       else
 838       {
 839         // Move the focus towards up
 840         MoveFocus(Toolkit::Control::KeyboardFocus::UP, deviceName);
 841       }
 842
 843       isFocusStartableKey = true;
 844     }
 845     else if(keyName == "Down")
 846     {
 847       if(mIsFocusIndicatorShown == HIDE)
 848       {
 849         // Show focus indicator
 850         mIsFocusIndicatorShown = SHOW;
 851       }
 852       else
 853       {
 854         // Move the focus towards down
 855         MoveFocus(Toolkit::Control::KeyboardFocus::DOWN, deviceName);
 856       }
 857
 858       isFocusStartableKey = true;
 859     }
 860     else if(keyName == "Prior")
 861     {
 862       if(mIsFocusIndicatorShown == HIDE)
 863       {
 864         // Show focus indicator
 865         mIsFocusIndicatorShown = SHOW;
 866       }
 867       else
 868       {
 869         // Move the focus towards the previous page
 870         MoveFocus(Toolkit::Control::KeyboardFocus::PAGE_UP, deviceName);
 871       }
 872
 873       isFocusStartableKey = true;
 874     }
 875     else if(keyName == "Next")
 876     {
 877       if(mIsFocusIndicatorShown == HIDE)
 878       {
 879         // Show focus indicator
 880         mIsFocusIndicatorShown = SHOW;
 881       }
 882       else
 883       {
 884         // Move the focus towards the next page
 885         MoveFocus(Toolkit::Control::KeyboardFocus::PAGE_DOWN, deviceName);
 886       }
 887
 888       isFocusStartableKey = true;
 889     }
 890     else if(keyName == "Tab")
 891     {
 892       if(mIsFocusIndicatorShown == HIDE)
 893       {
 894         // Show focus indicator
 895         mIsFocusIndicatorShown = SHOW;
 896       }
 897       else
 898       {
 899         // "Tab" key changes the focus group in the forward direction and
 900         // "Shift-Tab" key changes it in the backward direction.
 901         if(!DoMoveFocusToNextFocusGroup(!event.IsShiftModifier()))
 902         {
 903           // If the focus group is not changed, Move the focus towards forward, "Shift-Tap" key moves the focus towards backward.
 904           MoveFocus(event.IsShiftModifier() ? Toolkit::Control::KeyboardFocus::BACKWARD : Toolkit::Control::KeyboardFocus::FORWARD, deviceName);
 905         }
 906       }
 907
 908       isFocusStartableKey = true;
 909     }
 910     else if(keyName == "space")
 911     {
 912       if(mIsFocusIndicatorShown == HIDE)
 913       {
 914         // Show focus indicator
 915         mIsFocusIndicatorShown = SHOW;
 916       }
 917
 918       isFocusStartableKey = true;
 919     }
 920     else if(keyName == "")
 921     {
 922       // Check the fake key event for evas-plugin case
 923       if(mIsFocusIndicatorShown == HIDE)
 924       {
 925         // Show focus indicator
 926         mIsFocusIndicatorShown = SHOW;
 927       }
 928
 929       isFocusStartableKey = true;
 930     }
 931     else if(keyName == "Backspace")
 932     {
 933       // Emit signal to go back to the previous view???
 934     }
 935     else if(keyName == "Escape")
 936     {
 937     }
 938   }
 939   else if(event.GetState() == KeyEvent::UP)
 940   {
 941     if(keyName == "Return")
 942     {
 943       if(mIsFocusIndicatorShown == HIDE)
 944       {
 945         // Show focus indicator
 946         mIsFocusIndicatorShown = SHOW;
 947       }
 948       else
 949       {
 950         // The focused actor has enter pressed on it
 951         Actor actor = GetCurrentFocusActor();
 952         if(actor)
 953         {
 954           DoKeyboardEnter(actor);
 955         }
 956       }
 957
 958       isFocusStartableKey = true;
 959     }
 960   }
 961
 962   if(isFocusStartableKey && mIsFocusIndicatorShown == SHOW)
 963   {
 964     Actor actor = GetCurrentFocusActor();
 965     if(actor)
 966     {
 967       if(mEnableFocusIndicator == ENABLE)
 968       {
 969         // Make sure the focused actor is highlighted
 970         actor.Add(GetFocusIndicatorActor());
 971       }
 972     }
 973     else
 974     {
 975       // No actor is focused but keyboard focus is activated by the key press
 976       // Let's try to move the initial focus
 977       MoveFocus(Toolkit::Control::KeyboardFocus::RIGHT, deviceName);
 978     }
 979   }
 980 }
 981
 982 void KeyboardFocusManager::OnTouch(const TouchEvent& touch)
 983 {
 984   // if mIsFocusIndicatorShown is UNKNOWN, it means Configuration is not loaded.
 985   // Try to load configuration.
 986   if(mIsFocusIndicatorShown == UNKNOWN)
 987   {
 988     GetConfigurationFromStyleManger();
 989   }
 990
 991   // Clear the focus when user touch the screen.
 992   // We only do this on a Down event, otherwise the clear action may override a manually focused actor.
 993   if(((touch.GetPointCount() < 1) || (touch.GetState(0) == PointState::DOWN)))
 994   {
 995     // If mClearFocusOnTouch is false, do not clear the focus even if user touch the screen.
 996     if(mClearFocusOnTouch)
 997     {
 998       ClearFocus();
 999     }
1000
1001     // If KEYBOARD_FOCUSABLE and TOUCH_FOCUSABLE is true, set focus actor
1002     Actor hitActor = touch.GetHitActor(0);
1003     if(hitActor && hitActor.GetProperty<bool>(Actor::Property::KEYBOARD_FOCUSABLE) && hitActor.GetProperty<bool>(DevelActor::Property::TOUCH_FOCUSABLE))
1004     {
1005       SetCurrentFocusActor(hitActor);
1006     }
1007   }
1008 }
1009
1010 bool KeyboardFocusManager::OnWheelEvent(const WheelEvent& event)
1011 {
1012   bool consumed = false;
1013   Actor actor = GetCurrentFocusActor();
1014   if(actor)
1015   {
1016     // Notify the actor about the wheel event
1017     consumed = EmitWheelSignals(actor, event);
1018   }
1019   return consumed;
1020 }
1021
1022 bool KeyboardFocusManager::EmitWheelSignals(Actor actor, const WheelEvent& event)
1023 {
1024   bool consumed = false;
1025
1026   if(actor)
1027   {
1028     Dali::Actor oldParent(actor.GetParent());
1029
1030     // Only do the conversion and emit the signal if the actor's wheel signal has connections.
1031     if(!actor.WheelEventSignal().Empty())
1032     {
1033       // Emit the signal to the parent
1034       consumed = actor.WheelEventSignal().Emit(actor, event);
1035     }
1036     // if actor doesn't consume WheelEvent, give WheelEvent to its parent.
1037     if(!consumed)
1038     {
1039       // The actor may have been removed/reparented during the signal callbacks.
1040       Dali::Actor parent = actor.GetParent();
1041
1042       if(parent &&
1043          (parent == oldParent))
1044       {
1045         consumed = EmitWheelSignals(parent, event);
1046       }
1047     }
1048   }
1049
1050   return consumed;
1051 }
1052
1053 void KeyboardFocusManager::OnWindowFocusChanged(Window window, bool focusIn)
1054 {
1055   if(focusIn && mCurrentFocusedWindow.GetHandle() != window.GetRootLayer())
1056   {
1057     // Change Current Focused Window
1058     Layer rootLayer       = window.GetRootLayer();
1059     mCurrentFocusedWindow = rootLayer;
1060
1061     // Get Current Focused Actor from window
1062     Actor currentFocusedActor = GetFocusActorFromCurrentWindow();
1063     SetCurrentFocusActor(currentFocusedActor);
1064
1065     if(currentFocusedActor && (mEnableFocusIndicator == ENABLE))
1066     {
1067       // Make sure the focused actor is highlighted
1068       currentFocusedActor.Add(GetFocusIndicatorActor());
1069       mIsFocusIndicatorShown = SHOW;
1070     }
1071   }
1072 }
1073
1074 Toolkit::KeyboardFocusManager::PreFocusChangeSignalType& KeyboardFocusManager::PreFocusChangeSignal()
1075 {
1076   return mPreFocusChangeSignal;
1077 }
1078
1079 Toolkit::KeyboardFocusManager::FocusChangedSignalType& KeyboardFocusManager::FocusChangedSignal()
1080 {
1081   return mFocusChangedSignal;
1082 }
1083
1084 Toolkit::KeyboardFocusManager::FocusGroupChangedSignalType& KeyboardFocusManager::FocusGroupChangedSignal()
1085 {
1086   return mFocusGroupChangedSignal;
1087 }
1088
1089 Toolkit::KeyboardFocusManager::FocusedActorEnterKeySignalType& KeyboardFocusManager::FocusedActorEnterKeySignal()
1090 {
1091   return mFocusedActorEnterKeySignal;
1092 }
1093
1094 bool KeyboardFocusManager::DoConnectSignal(BaseObject* object, ConnectionTrackerInterface* tracker, const std::string& signalName, FunctorDelegate* functor)
1095 {
1096   Dali::BaseHandle handle(object);
1097
1098   bool                  connected(true);
1099   KeyboardFocusManager* manager = static_cast<KeyboardFocusManager*>(object); // TypeRegistry guarantees that this is the correct type.
1100
1101   if(0 == strcmp(signalName.c_str(), SIGNAL_PRE_FOCUS_CHANGE))
1102   {
1103     manager->PreFocusChangeSignal().Connect(tracker, functor);
1104   }
1105   else if(0 == strcmp(signalName.c_str(), SIGNAL_FOCUS_CHANGED))
1106   {
1107     manager->FocusChangedSignal().Connect(tracker, functor);
1108   }
1109   else if(0 == strcmp(signalName.c_str(), SIGNAL_FOCUS_GROUP_CHANGED))
1110   {
1111     manager->FocusGroupChangedSignal().Connect(tracker, functor);
1112   }
1113   else if(0 == strcmp(signalName.c_str(), SIGNAL_FOCUSED_ACTOR_ENTER_KEY))
1114   {
1115     manager->FocusedActorEnterKeySignal().Connect(tracker, functor);
1116   }
1117   else
1118   {
1119     // signalName does not match any signal
1120     connected = false;
1121   }
1122
1123   return connected;
1124 }
1125
1126 void KeyboardFocusManager::SetCustomAlgorithm(CustomAlgorithmInterface& interface)
1127 {
1128   mCustomAlgorithmInterface = &interface;
1129 }
1130
1131 void KeyboardFocusManager::EnableFocusIndicator(bool enable)
1132 {
1133   if(!enable && mFocusIndicatorActor)
1134   {
1135     mFocusIndicatorActor.Unparent();
1136   }
1137
1138   mEnableFocusIndicator = enable ? ENABLE : DISABLE;
1139 }
1140
1141 bool KeyboardFocusManager::IsFocusIndicatorEnabled() const
1142 {
1143   return (mEnableFocusIndicator == ENABLE);
1144 }
1145
1146 void KeyboardFocusManager::EnableDefaultAlgorithm(bool enable)
1147 {
1148   mEnableDefaultAlgorithm = enable;
1149 }
1150
1151 bool KeyboardFocusManager::IsDefaultAlgorithmEnabled() const
1152 {
1153   return mEnableDefaultAlgorithm;
1154 }
1155
1156 } // namespace Internal
1157
1158 } // namespace Toolkit
1159
1160 } // namespace Dali